What Causes Excessive Moisture Inside the Car?
2 Answers
Excessive moisture inside the car occurs because the outside weather is somewhat cold while the temperature inside the car is slightly higher, causing the water vapor inside to condense upon encountering the cold. Effective methods to remove moisture from the car: 1. Desiccants and bamboo charcoal are essential: Car owners can place several moisture absorbers or dehumidifier boxes in areas prone to accumulating moisture, such as the cabin or trunk, and remember to check and replace them regularly to keep the car dry and moisture-free. 2. Expose the car to more sunlight: Sunlight contains ultraviolet, infrared, and visible light. Especially during damp and rainy seasons, the heated car body will quickly expel the accumulated moisture inside. 3. Promptly repair peeling paint: If the paint or protective coating on the bottom or exterior of the car peels off, it may rust when exposed to rainwater, and humid air can accelerate the "deterioration" of the damaged areas. If the car is damaged, it's best to address it as soon as possible. 4. Regularly use the car audio system: During humid seasons, the chips in the car audio system become quite delicate, as moist air is most likely to corrode them. 5. Turn on the air conditioning to remove fog and moisture: Using the air conditioning's dehumidification function can help. When the air inside the car is humid, turn on the cold air mode. The car air conditioning not only regulates the cabin temperature but also effectively removes moisture from the interior.
Having driven for over a decade, I've noticed that high humidity inside the car commonly occurs during rainy days when windows are left open, allowing external moisture to seep through gaps; for instance, due to aging door seals that let in drafts. Wet items left inside the car, such as umbrellas or shoes, can also evaporate moisture and accumulate. I once experienced a clogged air conditioning drain hole, causing condensation water to pool in the chassis and leading to a musty smell. Prolonged parking without ventilation allows moisture from human breath to build up. I recommend regularly cleaning the drainage holes beneath the doors and remembering to close windows after rain. Sunroof drainage channels are prone to clogging and should be inspected. Poor rustproofing can allow moisture to corrode the car body, so I prefer parking in dry areas and using bamboo charcoal bags to absorb moisture. The southern rainy season is particularly severe, and keeping dehumidifier boxes handy is quite effective. Leather or carpets inside the car absorb moisture and dry slowly, so after cleaning, ensure they are thoroughly dried before driving to avoid secondary dampness issues.
